package com.cskaoyan.order.biz.handler;

import com.cskaoyan.mall.commons.exception.BaseBusinessException;
import com.cskaoyan.mall.commons.exception.BizException;
import com.cskaoyan.order.biz.context.CreateOrderContext;
import com.cskaoyan.order.biz.context.TransHandlerContext;
import com.cskaoyan.order.dal.entitys.Stock;
import com.cskaoyan.order.dal.persistence.StockMapper;
import com.cskaoyan.order.dto.CartProductDto;
import com.cskaoyan.order.feign.ShoppingFeign;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @Description: 扣减库存处理器
 **/
@Component
@Slf4j
public class SubStockHandler extends AbstractTransHandler {

    @Autowired
    private  StockMapper stockMapper;

    @Autowired
    ShoppingFeign shoppingFeign;

    @Override
    public boolean isAsync() {
        return false;
    }

    @Override
    @Transactional
    public boolean handle(TransHandlerContext context) {
       CreateOrderContext createOrderContext = (CreateOrderContext) context;
        List<CartProductDto> dtoList = createOrderContext.getCartProductDtoList();
        List<Long> productIds = createOrderContext.getBuyProductIds();
        if (CollectionUtils.isEmpty(productIds)){
            // for (CartProductDto cartProductDto : dtoList) {
            //     productIds.add(cartProductDto.getProductId());
            // }
            // 用lambda表达式取代for循环
            productIds = dtoList.stream()
                    .map(u -> u.getProductId())
                    .collect(Collectors.toList());

        }
        productIds.sort(Long::compareTo);
        List<Stock> stockList = stockMapper.findStocksForUpdate(productIds);

        // 锁定库存
        if (CollectionUtils.isEmpty(stockList)){
            throw new BaseBusinessException("库存未初始化！");
        }
        if (stockList.size() != productIds.size()){
            throw new BizException("部分商品库存未初始化！");
        }

        // 扣减库存
        for (CartProductDto cartProductDto : dtoList) {
          Long productId = cartProductDto.getProductId();
          Long productNum = cartProductDto.getProductNum();

          // // productNum不能超过限购数量
          //   //Item item = itemMapper.selectByPrimaryKey(productId);
          //   ResponseData responseData1 = shoppingFeign.itemInfo(productId);
          //   ProductInfoDto item = (ProductInfoDto) responseData1.getResult();
          //   if (productNum > item.getLimit_num()){
          //       throw new ValidateException("购买数量超过限购数量！");
          //   }

          Stock stock = new Stock();
          stock.setItemId(productId);
          stock.setLockCount(productNum.intValue());
          stock.setStockCount(-productNum);

          stockMapper.updateStock(stock);
        }


        return true;
    }
}